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https://issues.apache.org/jira/browse/CALCITE-4875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17438457#comment-17438457
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Jay Narale commented on CALCITE-4875:
-------------------------------------
PR at
[https://github.com/apache/calcite/pull/2598|https://github.com/apache/calcite/pull/2598]
> NVL Function Incorrectly changes nullability field of its operands
> ------------------------------------------------------------------
>
> Key: CALCITE-4875
> URL: https://issues.apache.org/jira/browse/CALCITE-4875
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jay Narale
> Priority: Major
>
> We rewrite the NVL function in
> _org/apache/calcite/sql2rel/StandardConvertletTable.java:303_ , during the
> rewrite we currently override the operands' nullability to be NOT NULL which
> is not needed. This causes issues if that operand is pushdown , since the
> input of that operand need not be not nullable whereas we forced that operand
> to be Not nullable
>
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